San Lorenzo Municipio, Puerto Rico
Municipio storm and disaster record · FIPS 72129 · population 37,680 · 53 sq mi
NOAA's Storm Events Database holds 151 records for San Lorenzo Municipio, Puerto Rico from 1950 through June 30, 2026, on 74 days; the most frequent are landslide and avalanche records (67 records). 129 of them are forecast-zone records, which the National Weather Service files once per zone: a county covered by several zones receives each one, so a single storm can add several records on the same day. The deadliest single record is the November 12, 2004 flood, filed for the forecast zone Eastern Interior, which covers the county: 2 deaths, 2 injuries and $2.3 million in damage in 2025 dollars. FEMA has issued 30 declarations naming the county since 1970, 28 of them for natural hazards; the latest for a natural hazard was “Tropical Storm Ernesto” on November 27, 2024.
The record, 1950 to 2026
Storm records filed for the county each year (2026 to June 30, 2026). Before 1996 NOAA recorded only tornadoes (from 1950), thunderstorm wind and hail (from 1955).
- recorded, no damage figure
- under $100,000
- $100,000 or more
- $1 million or more
- $10 million or more, or a death
- $100 million or more, or 10 deaths
- a year's colour: its recorded damage or deaths
- a year with a death
- 1955: wind and hail recorded from 1955
- 1996: all 48 event types from 1996
- Storm records
- 151on 74 days, 1950 to June 30, 2026
- Deaths recorded
- 42 injuries
- Damage, 2025 dollars
- $15Mas filed (scale steps before 1993)
- FEMA declarations
- 30latest 2024
Source: NOAA NCEI Storm Events Database, records through June 30, 2026 (file revision 20260918); damage converted to 2025 dollars with the BLS CPI-U. Search the record at NCEI. BLS consumer price index.
What hazards hit San Lorenzo Municipio most?
The most frequent records are landslide and avalanche records: 67 since 2003. Census land area gives no figure for San Lorenzo Municipio under this code, so it carries no per-area rank.
| Hazard | Records | Days | First, last | Killed | Injured | Damage | Rank in state |
|---|---|---|---|---|---|---|---|
| Landslides and avalanches | 67 | 32 | 2003-2023 | 0 | 0 | $6.6M | – |
| Floods | 40 | 25 | 2003-2023 | 4 | 2 | $5.7M | – |
| Hurricanes and tropical storms | 28 | 10 | 2000-2024 | 0 | 0 | $2.8M | – |
| Drought | 5 | 5 | 1997-2022 | 0 | 0 | – | – |
| Heat | 3 | 3 | 2023-2023 | 0 | 0 | – | – |
| High wind and dust storms | 3 | 2 | 2015-2025 | 0 | 0 | $32K | – |
| Fog, smoke and funnel clouds | 3 | 3 | 2001-2003 | 0 | 0 | – | – |
| Heavy rain | 2 | 1 | 2015-2015 | 0 | 0 | – | – |
Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.
When was the last damaging storm in San Lorenzo Municipio?
The most recent record with damage, injuries or deaths is the April 2, 2025 strong wind ($15,000 in damage in 2025 dollars).
| Date | Record | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2025-04-02 | Strong WindAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 30 kt wind | 0 | 0 | $15K |
| 2025-04-02 | Strong WindAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 30 kt wind | 0 | 0 | $16K |
| 2017-09-20 | Hurricane (Typhoon)Aguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 0 | 0 | $602K | |
| 2017-09-20 | Hurricane (Typhoon)Aguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 0 | 0 | $602K | |
| 2017-09-20 | Hurricane (Typhoon)Aguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 0 | 0 | $602K | |
| 2017-09-20 | Hurricane (Typhoon)Aguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 0 | 0 | $602K | |
| 2009-12-25 | Debris FlowAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 0 | 0 | $6.6M | |
| 2009-01-22 | FloodSan Lorenzo Municipio | 1 | 0 | – | |
| 2004-11-12 | FloodAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 2 | 2 | $2.3M | |
| 2003-11-10 | FloodAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 1 | 0 | $3.2M | |
| 2001-08-22 | Tropical StormAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 0 | 0 | $333K |
Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.
The deadliest and costliest records
| Date | Record | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2004-11-12 | FloodAguas Buenas Municipio and 8 more · forecast zone Eastern Interior A persistent upper trough to the west of Puerto Rico and a extremely moist low level air mass, brought numerous showers during the period from November 12-15. On the 12 November rainfall was already fairly impressive across the eastern and central interior, although the northeast quarter of the island received 1 to 2 ... | 2 | 2 | $2.3M | |
| 2009-01-22 | FloodSan Lorenzo Municipio A person was sleeping on a low water bridge and was overtaken by a sudden water crest at Barrio Espino in San Lorenzo, Hilario Perez sector, along road 181, Km. 13 from San Lorenzo to Patillas. | 1 | 0 | – | |
| 2003-11-10 | FloodAguas Buenas Municipio and 8 more · forecast zone Eastern Interior Heavy rains affected Puerto Rico during the week of November 10-15, leading to widespread flash flooding, and numerous mud, land and rock slides. A total of 19 municipalities were declared a federal disaster area with total damages estimated at around 45 million.On November 10, an active tropical wave approached ... | 1 | 0 | $3.2M |
| Date | Record | Character | Killed | Injured | Damage |
|---|---|---|---|---|---|
| 2009-12-25 | Debris FlowAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 0 | 0 | $6.6M | |
| 2003-11-10 | FloodAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 1 | 0 | $3.2M | |
| 2004-11-12 | FloodAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 2 | 2 | $2.3M | |
| 2017-09-20 | Hurricane (Typhoon)Aguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 0 | 0 | $602K | |
| 2025-04-02 | Strong WindAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 30 kt wind | 0 | 0 | $16K |
| 2025-04-02 | Strong WindAguas Buenas Municipio and 8 more · forecast zone Eastern Interior | 30 kt wind | 0 | 0 | $15K |
Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.
Is it getting more frequent?
Records per decade for San Lorenzo Municipio's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).
| Hazard | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020-26 |
|---|---|---|---|---|---|---|---|---|
| Landslides and avalanches | – | – | – | – | 0 | 59 | 7 | 1 |
| Floods | – | – | – | – | 0 | 25 | 11 | 4 |
| Hurricanes and tropical storms | – | – | – | – | 0 | 3 | 18 | 7 |
Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).
What time of year?
Records by month in San Lorenzo Municipio. The two busiest months are in violet.
The values, month by month
Jan 2 · Feb 0 · Mar 6 · Apr 8 · May 24 · Jun 4 · Jul 16 · Aug 24 · Sep 17 · Oct 17 · Nov 20 · Dec 13 (records).
Source: NOAA NCEI Storm Events Database, records by the month they began.
Federal disaster declarations for San Lorenzo Municipio
FEMA's register lists 30 declarations that include San Lorenzo Municipio: 20 major disasters, 10 emergencies and 0 fire management assistance declarations. Most were for hurricane (14) and severe storm (7).
| Declared | Number | Type | Title |
|---|---|---|---|
| 2024-11-27 | DR-4850 | Tropical Storm | Tropical Storm Ernesto |
| 2024-08-13 | EM-3610 | Severe Storm | Tropical Storm Ernesto |
| 2022-09-21 | DR-4671 | Hurricane | Hurricane Fiona |
| 2022-09-18 | EM-3583 | Hurricane | Tropical Storm Fiona |
| 2020-08-22 | EM-3537 | Hurricane | Tropical Storm Laura |
| 2020-07-29 | EM-3532 | Hurricane | Potential Tropical Cyclone Nine |
| 2020-03-27 | DR-4493 | Biological | Covid-19 Pandemic |
| 2020-03-13 | EM-3452 | Biological | Covid-19 |
| 2020-01-07 | EM-3426 | Earthquake | Earthquakes |
| 2019-08-27 | EM-3417 | Severe Storm | Tropical Storm Dorian |
| 2017-09-20 | DR-4339 | Hurricane | Hurricane Maria |
| 2017-09-18 | EM-3391 | Hurricane | Hurricane Maria |
| 2011-08-27 | DR-4017 | Hurricane | Hurricane Irene |
| 2011-08-22 | EM-3326 | Hurricane | Hurricane Irene |
| 2011-07-14 | DR-4004 | Severe Storm | Severe Storms, Flooding, Mudslides, and Landslides |
| 2008-10-01 | DR-1798 | Severe Storm | Severe Storms and Flooding |
| 2004-09-17 | DR-1552 | Severe Storm | Tropical Storm Jeanne and Resulting Landslides and Mudslides |
| 2003-11-21 | DR-1501 | Severe Storm | Severe Storms, Flooding, Mudslides, and Landslides |
| 2001-11-28 | DR-1396 | Severe Storm | Severe Storms, Flooding, Mudslides and Landslides |
| 1999-11-17 | EM-3151 | Hurricane | Hurricane Lenny |
| 1998-09-24 | DR-1247 | Hurricane | Hurricane Georges - 18 Sep 98 |
| 1996-09-11 | DR-1136 | Hurricane | Hurricane Hortense |
| 1995-09-16 | DR-1068 | Hurricane | Hurricane Marilyn |
| 1992-01-22 | DR-931 | Flood | Severe Storms & Flooding |
| 1989-09-21 | DR-842 | Hurricane | Hurricane Hugo |
| 1987-12-17 | DR-805 | Flood | Severe Storms & Flooding |
| 1979-09-02 | DR-597 | Hurricane | Hurricane David |
| 1975-09-19 | DR-483 | Flood | Tropical Storm Elioise |
| 1974-11-30 | DR-455 | Flood | Flooding |
| 1970-10-12 | DR-296 | Flood | Heavy Rains & Flooding |
Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.
Counties that share a border with San Lorenzo Municipio
Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.
Next
- Landslides and avalanches in Puerto RicoThe state's landslide and avalanche records, by county, year and month
- The Puerto Rico recordEvery hazard in the state, its deadliest events and its federal declarations
- FEMA's risk rating for each hazard in San Lorenzo MunicipioThe hazard risk calculator: 18 hazards beside the county's record
- Download San Lorenzo Municipio's FEMA declarations (CSV)30 rows: every declaration that named the county, for your own analysis